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dc.contributor.authorLyu, Benshuaien
dc.contributor.authorAzarpeyvand, Men
dc.date.accessioned2017-08-23T10:58:27Z
dc.date.available2017-08-23T10:58:27Z
dc.date.issued2017-09-10en
dc.identifier.issn0022-1120
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/266754
dc.description.abstractAn analytical model is developed for the prediction of noise radiated by an aerofoil with leading edge serration in a subsonic turbulent stream. The model makes use of the Fourier Expansion and Schwarzschild techniques in order to solve a set of coupled differential equations iteratively and express the far-field sound power spectral density in terms of the statistics of incoming turbulent upwash velocity. The model has shown that the primary noise reduction mechanism is due to the destructive interference of the scattered pressure induced by the leading edge serrations. It has also shown that in order to achieve significant sound reduction, the serration must satisfy two geometrical criteria related to the serration sharpness and hydrodynamic properties of the turbulence. A parametric study has been carried out and it is shown that serrations can reduce the overall sound pressure level at most radiation angles, particularly at small aft angles. The sound directivity results have also shown that the use of leading edge serration does not particularity change the dipolar pattern of the far-field noise at low frequencies, but it changes the cardioid directivity pattern associated with radiation from straight-edge scattering at high frequencies to a tilted dipolar pattern.
dc.description.sponsorshipThe first author (BL) wishes to gratefully acknowledge the financial support provided by the Cambridge Commonwealth European and International Trust and China Scholarship Council. The second author (MA) would like to acknowledge the financial support of the Royal Academy of Engineering.
dc.language.isoenen
dc.publisherCambridge University Press
dc.subjectaeroacousticsen
dc.subjectflow–structure interactionsen
dc.subjectnoise controlen
dc.titleOn the noise prediction for serrated leading edgesen
dc.typeArticle
prism.endingPage234
prism.publicationDate2017en
prism.publicationNameJournal of Fluid Mechanicsen
prism.startingPage205
prism.volume826en
dc.identifier.doi10.17863/CAM.12825
dcterms.dateAccepted2017-06-01en
rioxxterms.versionofrecord10.1017/jfm.2017.429en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-09-10en
dc.contributor.orcidLyu, Benshuai [0000-0002-8751-7875]
dc.identifier.eissn1469-7645
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2017-08-03en
rioxxterms.freetoread.startdate2018-02-03


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